Face it, the LQS is not the one and only source of quality material for quilt making. Bonnie Hunter makes show quilts out of mens shirts from places like Goodwill and thrift stores or out of closets. Easy enough to pick out the 100% cotton ones. I would use them for a quilt for husband or sons.
I got hundreds of yards of properly stored 1970 vintage cottons at a garage sale once. Fabric was still on bolt, kept out of sun, and strong. Who is to tell me not to use it for lovely charity quilts and their backs?
It is up to each of us who use a variety of fabric to sort and determine what is a quality cotton of whatever vintage and would make a useful and lovely quilt. I got bags and bags from a previous quilter and went thru each piece to ensure it was useable. I like to sort and iron at the same time.
Let those who want LQS specific fabrics join their groups and those of us with more creativity and flexibility join their own.